counter/vite.config.js

// vite.config.js
import { sveltekit } from '@sveltejs/kit/vite';
import { defineConfig, loadEnv } from 'vite';

export default ({ mode }) => {
  const env = loadEnv(mode, process.cwd(), '');
  const isDev = mode === 'development';

  const allowed = env.VITE_ALLOWED_HOSTS
    ? env.VITE_ALLOWED_HOSTS.split(',').map(s => s.trim()).filter(Boolean)
    : undefined;

  return defineConfig({
    plugins: [sveltekit()],
    server: isDev
      ? {
          host: true,
          port: 5173,
          ...(allowed && { allowedHosts: allowed }),
          ...(env.VITE_HMR_HOST && {
            hmr: {
              host: env.VITE_HMR_HOST,
              protocol: env.VITE_HMR_PROTOCOL || 'wss',
              clientPort: Number(env.VITE_HMR_PORT || 443)
            }
          })
        }
      : undefined
  });
};